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Potential well
About: Potential well is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 30812 citations.
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TL;DR: In this paper, the effects of surfactants on the structural and optical properties of nanoparticles were investigated by UV-visible and PL spectroscopy, and the optical band gap values were determined by simple energy wave equation and Tauc plot method.
17 citations
TL;DR: The effect of synthesis temperature on the crystalline size, microstructure, optical properties, and energy gap of synthesized zinc oxide nanoparticles has been investigated in this paper, where the particle size was found to reduce from 26nm to 17nm when the reaction temperature was increased from room temperature to 50°C.
Abstract: Zinc oxide nanoparticles have been synthesized at room temperature and at 50°C via precipitation method for the present study. The effect of synthesis temperature on the crystalline size, microstructure, optical properties, and energy gap of the synthesized zinc oxide nanoparticles has been investigated. The particle size was found to reduce from 26 nm to 17 nm when the reaction temperature was increased from room temperature to 50°C. Energy gap of the prepared samples has been theoretically determined using effective mass model equation and compared with the experimental value. It depicts that the energy gap of the smaller nanoparticles is higher than the bigger one. The recorded blue shift confirmed the quantum confinement effect. Compositional quality and functional group of the zinc oxide nanoparticles have been studied, and the frequency of zinc oxide nanoparticles has been observed at two different regions, 566 cm−1 and 432 cm−1. The recorded ultraviolet-visible spectrum shows absorption peaks at 36...
17 citations
TL;DR: In this article, the authors synthesize colloidal cadmium telluride (CdTe) quantum dots and their nanoparticles by one pot sonochemical reactions under multibubble sonoluminescence (MBSL) conditions, which are quite mild and facile compared to other typical high temperature solution-based methods.
Abstract: Colloidal cadmium telluride (CdTe) quantum dots (QDs) and their nanoparticles have been synthesized by one pot sonochemical reactions under multibubble sonoluminescence (MBSL) conditions, which are quite mild and facile compared to other typical high temperature solution-based methods. For a typical reaction, and tellurium powder with hexadecylamine and trioctylphosphine/trioctylphosphineoxide (TOP/TOPO) as a dispersant were sonicated in toluene solvent at 20 KHz and a power of 220W for 5-40 min at 60 . The sizes of CdTe particles, in a very wide size range from 2 nm-30 , were controllable by varying the sonicating and thermal heating conditions. The prepared CdTe QDs show different colors from pale yellow to dark brown and corresponding photoluminescence properties due mainly to the quantum confinement effect. The CdTe nanoparticles of about 20 nm in average were found to have band gap of 1.53 eV, which is the most optimally matched band gap to solar spectrum.
17 citations
16 Mar 2018
TL;DR: In this paper, the structural, electronic properties and quantum confinement effects of zinc oxide nanotubes and nanowires with different diameters are discussed within density functional theory and the pseudo potential approximation.
Abstract: Motivation to fact that zinc oxide nanowires and nanotubes with successful synthesis and the mechanism of formation, stability and electronic properties have been investigated; in this study the structural, electronic properties and quantum confinement effects of zinc oxide nanotubes and nanowires with different diameters are discussed. The calculations within density functional theory and the pseudo potential approximation are done. The electronic structure and energy gap for Armchair and zigzag ZnO nanotubes with a diameter of about 4 to 55 Angstrom and ZnO nanowires with a diameter range of 4 to 23 A is calculated. The results revealed that due to the quantum confinement effects, by reducing the diameter of nanowires and nanotubes, the energy gap increases. Zinc oxide semiconductor nanostructures since having direct band gap with size-dependent and quantum confinement effect are recommended as an appropriate candidate for making nanoscale optoelectronic devices.
16 citations
TL;DR: In this article, the energy bandgap of ternary alloyed lead cobalt sulfide quantum dots has been engineered for visible light optoelectronic applications, and the surface morphology of the prepared alloyed Pb0.8Co0.2S photoanodes was characterized using a transmission electron microscope.
Abstract: The energy bandgap of ternary alloyed lead cobalt sulfide quantum dots has been engineered for visible light optoelectronic applications. Ternary Pb0.8Co0.2S QDs were synthesized in situ onto TiO2 electrodes using a sub-sequential chemical bath deposition method up to 7 times. The surface morphology of the prepared alloyed Pb0.8Co0.2S QDs photoanodes was characterized using a transmission electron microscope. The X-ray diffraction technique was used to study the structural properties of the prepared alloyed photoanodes. The optical properties were characterized using a UV–visible–NIR spectrophotometer in the visible region range. The absorption of the prepared photoanodes increases as the no. of deposition times rises up to 7. Besides, the energy bandgap of the alloyed photoanodes is red-shifted from 3.15 eV (393 nm) to 1.68 eV (738 nm). These bandgap red shifts are mainly attributed to the quantum confinement effect. Based on optical properties measurements, the prepared ternary alloyed QDs could be utilized effectively in visible light optoelectronic applications.
16 citations